Improvement in washer jor lock-nuts



D. ELLIOT & SEELY. WASHER FOR LOCK NUTS.

No. 74,060. Patented Feb 4, 1868.

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D. ELLIOT 'AND E. SEELY. OF NEW "YORK, Y.

Letters Patent No. 74,0 6Q. dated February 4, i868.

l IMPROVEMENT IN WASHER FOR LOCK-NUTS.

TO ALL WHOM IT MAY CONCERN: 1

Be it known that we, D..ELLIOT and E. SEELY, of the city, county, and State of New York, have invented new and improved Pawl-und-Ratchet Attachment for the Nuts of Screw-Bolts, and that the following descriptio'n, taken in connection with the accompanying drawings, hereinafter referred-to, forms a full and exact specification of the same, wherein we have set forth the nature and principlesof our said improvements, by which our invention may be dist nguished from all others of a similar class, together with such parts as we claim and desire to have secured to us by Letters Patent.

This invention relatesto a new and improved pawl-and-ratchet attachment for the nuts of screw-bolts, whereby the nuts are prevented from casually loosening or becoming unscrewed.

The invention consists in a novel manner of constructing the pawl on the washoroi the bolt,and in forming the ratchet on the nut, as hereinafter fully shown and'described, whereby a very economical device for the pur-. pose specified is obtained. In the accompanying sheet of drawings Figure 1 is a side sectional view of a washer and nut pertaining to our invention, takenv in the line z z, fig. 2, the bolt not being in section, but the wood or article through which the bolt passes being bisected in the same line as the washer and nut. i

Figure 2, a. face view of the washer.

Figure 3, an inner end view of the nut.

Figure 4, a section of the not taken in the line y, fig. 3.

Figure 5, a section of the nut taken in the same line y y, and showing a modification of the ratchet-tecth.

Similar letters of reference indicate like parts. V

A represents a piece of wood, or other article, through which a screw-bolt, B, passes. This bolt may be constructed in the usual manner,'a being the head at one end, and 6 the screw at-the opposite end. 0 rcpre cents a. washer constructed of sheet metal, and fitted over the screw-end oi the bait. This washer should be prevented from turning .on the bolt, and various plans may be devised for that purpose. For instance, one end or edge of the washer maybe turned or bent over one edge of the wood A, as sho'wn' at c in fig. 1, or the washer may be punched, so as to form a burr to fit in a countersink inA. In striking, punching, or cutting out the washer, a curved slit is made concentric with the central hole at, and this slitted -portien is bent or curvedupward to form a pawl, D, which isshown clearly in figs. 1 audit. E represents the nut of the bolt, which is constructed with a chamber, a, in its inner end, to receive-the pawl D when the nut" is screwed on the bolt. The bottom of the chamber e is toothed to form a. ratchet, and these teeth, designated byf, slip or worlt over the pawl D when the nut is being screwed on the bolt, but the pawl prevents theuut from casually unscrewing.

We design, in practice, to have the ratchct-tecthf of the nut constructed intwo difi'erent ways, one with edges in line or parallel with the axis of the bolt, (sce'fig. 5,) so that the nut cannot be unscrewed, even by the application of a. wrench, without breaking of the pawl D. Teeth constructed on the nut in this way are to he used in those cases where it is not necessary to unscrew the not at any time. The other way of constructing the ratchet-teeth consists in having the axisof-the same slightly inclined, as shown in fig. 4, so that by the application of a wrench, and a suitable effort, the edges of the ratchet-teeth may be made to-slip ovcr'the paw 1 and the nut unscrewed without breaking the pawl. The ratchet-teethme constructed according to this latter Ian-in those cases where it is necessary, occasionally, to unscrew the nut from the bolt. In either form of ratchet-teeth, however, it is impossible for the nut to become casually unscrewed.

This device will not augment, in an appreciable degree, the cost of the manufacture of screw-bolts. The washer O, with its pa'wl'D, may be punched or'c-ut outfrorn a sheetmctol plate atone operation,- and the ratchetteethf may be pressed or swaged in the nut Eduring the process of manufacturing'th'e same.

Having thus described our invention, we claim as new, and desire to 'secureby Letters Patent- The washer C, constructed as described, provided with the concentric pawl D,cut from it,.and ada ted to fit into the ratchet-teethf formed in the chamber of the nut E, to prevent the said nut. from turning oh the bolt B, as herein shown and described.

The above specification of our invention signed by us, this 24th day of July, 1867.

' D. ELLIOT,

E. SEELY. Witnesses:

J. A. SERVICE, .Amx. F. Ross-Mrs. 

